I am working on a poster that will be printed on an A0-sized canvas cloth. The background image of the poster is this public domain Indy farmland.
On top of the background, I put several panes with white background and black text.
I heard that when printing on a canvas, the background image might interfere with the texture of the canvas and look unclear. Is there a way to manipulate the image so that it looks good as a large background image?
EDIT: To see what I mean by "looks good", look at the image in a very large zoom-in. You can see stains of a reddish color inside the squares. This is not visible in the original image, but it will be visible when printing on an AO-size poster. Is there a way to clean the image of these stains?